Hyperfine interaction in the Autler-Townes effect II: control of two-photon selection rules in the Morris-Shore basis

• URL: http://arxiv.org/abs/2312.02801v2
• Date: Sun, 24 Dec 2023 22:28:17 GMT
• Title: Hyperfine interaction in the Autler-Townes effect II: control of two-photon selection rules in the Morris-Shore basis
• Authors: Arturs Cinins and Dmitry K. Efimov and Martins Bruvelis and Kaspars Miculis and Teodora Kirova and Nikolai N. Bezuglov and Igor I. Ryabtsev and Marcis Auzinsh and Aigars Ekers
• Abstract summary: We investigate the absence of certain bright peaks in Autler-Townes laser excitation spectra of alkali metal atoms. Our research revealed that these dips in the spectra are caused by a specific architecture of adiabatic (or laser-dressed'') states in hyperfine (HF) components.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigated the absence of certain bright peaks in Autler-Townes laser excitation spectra of alkali metal atoms. Our research revealed that these dips in the spectra are caused by a specific architecture of adiabatic (or ``laser-dressed'') states in hyperfine (HF) components. The dressed states' analysis pinpointed several cases where constructive and destructive interference between HF excitation pathways in a two-photon excitation scheme limits the available two-photon transitions. This results in a reduction of the conventional two-photon selection rule for the total angular momentum $F$, from $\Delta F= 0,\pm 1$ to $\Delta F\equiv 0$. Our discovery presents practical methods for selectively controlling the populations of unresolvable HF $F$-components of $ns_{1/2}$ Rydberg states in alkali metal atoms. Using numerical simulations with sodium and rubidium atoms, we demonstrate that by blocking the effects of HF interaction with a specially tuned auxiliary control laser field, the deviations from the ideal selectivity of the HF components population can be lower than $0.01\%$ for Na and $0.001\%$ for Rb atoms.

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